| 摘要 |
A straddle carrier including a spreader in a bay that is raised and lowered by two fluid rams cooperating with opposite ends of the spreader is disclosed herein. The hydraulic circuit supplying fluid to the fluid rams includes a valve that prevents flow of hydralic fluid from the rams when the conduits leading to the rams are not pressurized but also includes an electrically actuated valve that allows the spreader to be lowered without hydraulic power.
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